Refrigerant



Patented Oct. 29, I931 UNITED STATES PAT-EN OFE QE CHRISTIAN DANTSIZEN, OF SGHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELEC- TRIG COMPANY, ACORPORATION' OF NEW YORK wmm No Drawing.

temperatures is thus low enough so that it can be transported in cork-stoppered, glass bottles, and yet high enough at, say, 10 C., to permit'its use in a refrigerating machine. This property makes it admirably suited for use with certain types of low pressure refrigerators, such as the rotary compressor types. It is heavier. than, and practically not misciblewith the lubricating oils ordinarily used in refrigerating machines; that is, it is not miscible in all proportions with lubricating oils. Both ofthese proper- LApplicatlon filed May 21, 1929. Serial No. 864,942.

sure and temperature, and liberated by being compressed and condensed in radiators within the building to be heated.

What I claim as new and desire to secure byLetters Patent of the "United States, is:

A refrigerating system comprising a compressor, said system havin oil therein for lubricating the parts of said compressor, a condenser, an. evaporator, and a refrigerant circulated through the system by said com pressor and coming in contact with said lubricating oil, said refrigerant consisting of methyl formate witholt admixture with ether or any other substance which would cause'it' to'become miscible to any substantial extent with said lubricating oil.

In witness whereof, I have hereunto set my hand this QOt-h'da of May, 1929.

CHRIST N DANTSIZEN.

ties are highly desirable in refrigeratlon.

Since it issubstantially not miscible with oil, there is no danger of materially thinning the lubricating oils, as is the case with organic halides which are used as refrigerants. This is a decided advantage. It is non-corrosive and, hence, does not attack the metal parts with which it comes in contact. It is relatively non-poisonous and therefore suited for use in domestic refrigerating machines.

In use, methyl formate may be employed in a system of refrigeration, as in the compressor type, passing through the cycle of first being-compressed by thecompressor, then to a condenser, from there to an expansion cha'mber, or evaporator, and finally returning to the compressor to complete the cycle.

Since methyl formate has a low vapor pressure at high temperatures and is relativelynon-poisonous, it is well adapted for use in heating systems employing the refrigeration cycle. In such a s stem the heat may be absorbed from outsi e of the building by evaporation of the methyl formate at low'pres- 

